使用宽带Wi-Fi（BindException）时，带有MongoDB的Spring Boot应用程序不会运行，但通过移动热点Wi-Fi连接成功运行

Question

我的Spring boot应用程序使用MongoDB Spring boot starter

    implementation 'org.springframework.boot:spring-boot-starter-data-mongodb'

我的JPA存储库类扩展了org。springframework。数据mongodb。存储库。MongoRepository和我的应用程序类使用这个注释-@EnableMongoRepositories。我使用的是一个无服务器的MongoDB uri，比如MongoDB srv://：@xyz。abc。mongodb。净/xyz

问题是，当我将我的Windows 10笔记本电脑Wi-Fi连接到宽带互联网连接时，我在应用程序启动时得到一个“java.net.BindException：无法分配请求的地址：connect”（下面的堆栈跟踪），而当我将我的Wi-Fi连接到移动热点时，它工作正常。如何找出mongo dB客户端正在使用的冲突端口？

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.mongodb.client.MongoClient]: Factory method 'mongo' threw exception; nested exception is java.io.UncheckedIOException: java.net.BindException: Cannot assign requested address: connect
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.18.jar:5.3.18]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.18.jar:5.3.18]
    ... 85 common frames omitted
Caused by: java.io.UncheckedIOException: java.net.BindException: Cannot assign requested address: connect
    at java.base/sun.nio.ch.DatagramSocketAdaptor.connect(DatagramSocketAdaptor.java:120) ~[na:na]
    at java.base/java.net.DatagramSocket.connect(DatagramSocket.java:341) ~[na:na]
    at jdk.naming.dns/com.sun.jndi.dns.DnsClient.doUdpQuery(DnsClient.java:408) ~[jdk.naming.dns:na]
    at jdk.naming.dns/com.sun.jndi.dns.DnsClient.query(DnsClient.java:214) ~[jdk.naming.dns:na]
    at jdk.naming.dns/com.sun.jndi.dns.Resolver.query(Resolver.java:81) ~[jdk.naming.dns:na]
    at jdk.naming.dns/com.sun.jndi.dns.DnsContext.c_getAttributes(DnsContext.java:434) ~[jdk.naming.dns:na]
    at java.naming/com.sun.jndi.toolkit.ctx.ComponentDirContext.p_getAttributes(ComponentDirContext.java:235) ~[na:na]
    at java.naming/com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.getAttributes(PartialCompositeDirContext.java:141) ~[na:na]
    at java.naming/com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.getAttributes(PartialCompositeDirContext.java:129) ~[na:na]
    at java.naming/javax.naming.directory.InitialDirContext.getAttributes(InitialDirContext.java:171) ~[na:na]
    at com.mongodb.internal.dns.DefaultDnsResolver.resolveAdditionalQueryParametersFromTxtRecords(DefaultDnsResolver.java:114) ~[mongodb-driver-core-4.4.2.jar:na]
    at com.mongodb.ConnectionString.<init>(ConnectionString.java:388) ~[mongodb-driver-core-4.4.2.jar:na]
    at org.springframework.boot.autoconfigure.mongo.MongoPropertiesClientSettingsBuilderCustomizer.applyHostAndPort(MongoPropertiesClientSettingsBuilderCustomizer.java:84) ~[spring-boot-autoconfigure-2.6.6.jar:2.6.6]
    at org.springframework.boot.autoconfigure.mongo.MongoPropertiesClientSettingsBuilderCustomizer.customize(MongoPropertiesClientSettingsBuilderCustomizer.java:54) ~[spring-boot-autoconfigure-2.6.6.jar:2.6.6]
    at org.springframework.boot.autoconfigure.mongo.MongoClientFactorySupport.customize(MongoClientFactorySupport.java:55) ~[spring-boot-autoconfigure-2.6.6.jar:2.6.6]
    at org.springframework.boot.autoconfigure.mongo.MongoClientFactorySupport.createMongoClient(MongoClientFactorySupport.java:49) ~[spring-boot-autoconfigure-2.6.6.jar:2.6.6]
    at org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration.mongo(MongoAutoConfiguration.java:55) ~[spring-boot-autoconfigure-2.6.6.jar:2.6.6]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.18.jar:5.3.18]
    ... 86 common frames omitted
Caused by: java.net.BindException: Cannot assign requested address: connect
    at java.base/sun.nio.ch.Net.connect0(Native Method) ~[na:na]
    at java.base/sun.nio.ch.Net.connect(Net.java:574) ~[na:na]
    at java.base/sun.nio.ch.DatagramChannelImpl.connect(DatagramChannelImpl.java:1243) ~[na:na]
    at java.base/sun.nio.ch.DatagramSocketAdaptor.connectInternal(DatagramSocketAdaptor.java:91) ~[na:na]
    at java.base/sun.nio.ch.DatagramSocketAdaptor.connect(DatagramSocketAdaptor.java:118) ~[na:na]
    ... 107 common frames omitted
    

Answer 1

移动数据IP是动态的

您的应用程序似乎在启动时创建了很多连接，这在使用wifi时会因为静态IP而导致问题；另一方面，移动数据具有动态ip

如果是这样的话，请检查你的申请。对于windows，在启动应用程序后，使用下面的命令检查有多少IP正在使用，这将为您提供一个想法。

netstat -ano

如果以上对您的应用程序是正确的，请考虑使用任何可用的数据库连接池库（例如Hikari等）来建立连接，以便您的应用程序创建有限的连接。